BrF can be prepared by reaction of Br2 and F2 in various solvents below –100 °C. In solution it is identified by 19F NMR and Raman spectroscopy. From CH3Cl solution a single crystal structure determination of a BrF/CH3Cl adduct was obtained. The preparation from BrF3 and Br2 at 600 °C also delivers BrF in small amounts. The crystal structure of BrCl comes in an ordered and a disordered variety. The
Spin-spin and spin-rotation constants of NBr(X3Σ−)
作者:A.T. Pritt
DOI:10.1016/0022-2852(88)90282-2
日期:1988.7
transition in NBr were obtained from the F Br + HN 3 chemiluminescence flame. The spectra revealed two strong branches, SR and QP, and two much weaker branches, OP and QR, with the QQ branch unobserved. The resolution of the spectrometer was not sufficient to resolve the two naturally occurring isotopes of Br. Analysis of the rotational lines yields the following set of molecular constants: ν00 = 14 812
Abstract Diodelaser spectra of BrF and BrCl below 700 cm −1 were observed and analyzed. Transitions in the 1-0 and 2-1 bands of 79 BrF and 81 BrF and those in the 1-0, 2-1, and 3-2 bands of 79 Br 35 Cl, 81 Br 35 Cl, 79 Br 37 Cl, and 81 Br 37 Cl were fitted to seven and eight Dunham coefficients, respectively. Many BrCl lines, which can be used for wavenumber calibration of diodelaser spectra, were
Millimeter wave measurements of the rotational spectra of ClF, BrF, BrCl, ICl, and IBr
作者:Robert E. Willis、William W. Clark
DOI:10.1063/1.439780
日期:1980.5
The rotational spectra of all twelve stable isotopic species of ClF, BrF, BrCl, ICl, and IBr were observed and measured in the millimeter wave region by means of a sensitive microwave spectrometer. Transitions were detected over a wide range of frequencies for molecules in both the ground vibrational state and several excited states. The rotational spectrum of each molecule was split by the nuclear quadrupole interaction. Altogether, 250 new lines were measured. These correspond to 136 pure rotational transitions. Values of the Dunham coefficients Y01, Y11, Y21, Y31, Y02, Y12, and Y03 were obtained from a computer analysis of the measured frequencies. From these coefficients a number of equilibrium constants were derived to significantly greater accuracy than in previous work. In particular, the equilibrium distance, re, was found to two or three more significant figures.